P. N. W. Baxter
FULL PAPER
(e) 301 (104611), 318 (84648), 362 (47160mÀ1cmÀ1); fluorescence emis-
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sion ([4] 2.45 Â 10À6 moldmÀ3 in CH2Cl2, 301 nm excitation): lmax
ꢀ
ꢀ
453 nm; IR: nÄ 2210 (s) (C C), 2154 (w) (C C), 1571 (s), 1526 (m), 1510
(m), 1468 (m), 1405 (s), 837 (s), 826 (s), 762 (m), 578 cmÀ1 (s); FABMS
(recorded in 10% CF3COOH/CHCl3): m/z (%): 653 (100) [M H];
HRMS (FAB, 10% CF3COOH/CHCl3, [M H]) calcd for C48H21N4:
653.1766; found: 653.1753.
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Acknowledgement
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[18] Pyridine-type ligands connected to/or within electronically delocal-
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¡
The College de France is acknowledged for financial support and Roland
Graff for the 1H NMR COSY, NOESY, and ROESY experiments. Dr
Bernard Dietrich, Prof. Alexandre Varnek and Dr Jonathan Nitschke are
also thanked for helpful discussions.
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Chem. Eur. J. 2003, 9, 2531 2541